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Last Wednesday, BlackBerry , formerly known as Research In Motion, unveiled its new generation of phones, which feature the new BB10 operating system. Observers did not seem particularly impressed. My Foolish colleague Anders Bylund wrote, "I expected the new line of BlackBerry 10 phones to be masterpieces of truly modern hardware with some unexpected wrinkles thrown in for good measure. But what we got looks a lot like Samsung's finest handset from last year." The apparent letdown halted BlackBerry's recent rally in its tracks. Shares slid from a 52-week high at $18.32 on Jan. 24 to less than $13 on Jan. 31.

While Blackberry's new Z10 and Q10 smartphones are not revolutionary, they are still very solid entries in the market. The browsing experience is leaps and bounds better than on previous BlackBerry phones. Moreover, BB10 provides a differentiated experience through software features such as the "BlackBerry Hub" (a unified page for messages, emails, texts, social media updates, etc.) and "Blackberry Balance" (a feature to separate work and personal data and apps).

These upgrades should be sufficient to keep BlackBerry loyalists within the fold. Moreover, the initial data suggest that a good number of early adopters are impressed by the new OS and are switching from iPhone and Android. If BlackBerry can continue to attract interest from even a small portion of iPhone and Android users (and that's a big if), shares could double in the next year.

BlackBerry's fallMuch of the recent pessimism surrounding BlackBerry is the result of an understandable "show-me" attitude among investors. The company was the clear smartphone leader five years ago, but failed to react to Apple's entry into the market with the iPhone. As the iPhone and phones running Google's Android OS vastly expanded the smartphone market, BlackBerry missed out on the growth opportunity. Most notably, in the past four quarters, the total number of BlackBerry users has grown by only 6%.

Much has been made of BlackBerry's market share losses during the past two years. However, those statistics should be taken with a grain of salt. BlackBerry has been trying to compete with an outdated OS (BB7), and it has been widely known for more than a year that a new QNX-based OS was on its way. As a result, current BlackBerry users have delayed their upgrades and potential "conquests" have been waiting for the new OS. The result is that BlackBerry sales dropped precipitously in 2012, even though the Blackberry user base actually grew slightly.

According to IDC, BlackBerry shipped 32.5 million smartphones in 2012, down 36.4% year over year. This resulted in the company's market share contracting from 10.3% to 4.6%. However, BlackBerry's market share is much stronger when measured by the number of subscribers. This better reflects the brand's strength, as customers who have stuck with BlackBerry this long are likely to upgrade to the new BB10 phones.

The coming upgrade cycleIn the U.S., BlackBerry's share of smartphone users was still 7.3% in November 2012, despite Apple's massive iPhone sales last quarter. In the U.K., BlackBerry still has more than 8 million subscribers out of a total market of 35 million to 40 million, putting its market share around 20%. Lastly, as of August 2012, BlackBerry had even higher market share in its home market of Canada, at 27%. These three countries -- BlackBerry's largest markets -- have accounted for 40%-50% of the company's revenue in recent years.

Between the U.S., the U.K., and Canada, BlackBerry has approximately 19 million subscribers (8.5 million in the U.S., 8 million in the U.K., and 2.5 million in Canada). Most "casual" BlackBerry users have long since switched to iPhone or Android. The remaining users are primarily hardcore BlackBerry fans, and the majority will upgrade to the new BB10 phones over the next year. This will provide a solid baseline of demand to return BlackBerry to profitability in fiscal year 2014 and give the company a chance to rebuild its image.

Early successesThe new Z10 all-touch phone was released in the U.K. on Jan. 31. BlackBerry has not released official sales figures, but according to numerous reports, the phone has sold out at many retailers (particularly the white version). According to Barclays, initial sales of the Z10 have been better than for Nokia's flagship Lumia 920.

The Z10 also had a solid start in Canada, where it went on sale this week. Pre-order demand was strong, and CIBC claims that approximately 50% of Z10 preorders came from current iPhone or Android users. If that level of "conquest sales" holds up, BlackBerry will easily outperform the market's expectations in the coming year.

This isn't NokiaBlackBerry is often compared to Nokia; the two led the smartphone market five years ago, and are now banking on comebacks with new operating systems (BB10 and Windows Phone 8, respectively). However, Nokia never built the customer loyalty of the BlackBerry brand; there's no Nokia equivalent of the phrase "CrackBerry." Upgrade demand from longtime BlackBerry users should drive strong sales for the next year, particularly after the Q10 model (which includes a traditional QWERTY keyboard) is released this spring.

Given these promising beginnings for BB10, it is surprising that BlackBerry still trades at a discount to its book value of $9.3 billion (just under $18 a share). If the company can drive the upgrade cycle over the next year while bringing in some new customers, shareholders will be rewarded nicely.

Want to learn more about the smartphone market's other potential comeback story? Like BlackBerry, Nokia's been struggling in a world of Apple and Android smartphone dominance. However, the company has banked its future on its next generation of Windows smartphones. Motley Fool analyst Charly Travers has created a new premium report that digs into both the opportunities and risks facing Nokia to help investors decide if the company is a buy or sell. To get started, simply click here now.